You don't need to download any libraries to get PHP portlet working.
Liferfay will automatically do the download but if I'm behind a firewall, I think I downloaded the following jars.
#
# Set the URLs of Libraries that might be needed to download during the
# auto deploy process.
#
library.download.url.resin.jar=http://cdn.files.liferay.com/public/quercus/4.0.11/resin.jar
library.download.url.script-10.jar=http://cdn.files.liferay.com/public/quercus/3.1.9/script-10.jar
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